pcap_activate - activate a capture handle
int pcap_activate(pcap_t *p);
pcap_activate() is used to activate a packet capture handle to look at packets on the network, with the options that were set on the handle being in effect.
pcap_activate() returns 0 on success without warnings, a non-zero positive value on success with warnings, and a negative value on error. A non-zero return value indicates what warning or error condition occurred.
The possible warning values are:
The possible error values are:
If PCAP_WARNING_PROMISC_NOTSUP, PCAP_ERROR_NO_SUCH_DEVICE, or PCAP_ERROR_PERM_DENIED is returned, pcap_geterr() or pcap_perror() may be called with p as an argument to fetch or display an message giving additional details about the problem that might be useful for debugging the problem if it's unexpected.
Additional warning and error codes may be added in the future; a program should check for positive, negative, and zero return codes, and treat all positive return codes as warnings and all negative return codes as errors. pcap_statustostr(3PCAP) can be called, with a warning or error code as an argument, to fetch a message describing the warning or error code.
If pcap_activate() fails, the pcap_t * is not closed and freed; it should be closed using pcap_close().
|24 November 2019|